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Somehow you mixed up. What you say is my quote is from dhusman. Here is my complete post again <blockquote class="quote"> <div class="quote-user">"dehusman</div> <div class="quote-content">Volker: Metaphors for what we are talking about. You have a beam that centilevers from a wall. You drop a load on it and the beam shears off and the load falls to the ground. That's a slope failure. You have a beam that centilevers from a wall. You drop a load on it and the beam deforms and bends, the load falls to the ground. That's liquifaction."</div> </blockquote>   First, no need to explain the difference between liquifaction and landslide to me. As I said before I'm a civil engineer and that means I learned at least the fundamentals in soil mechanics and geotechnic before specializing in structural design, where these fundamentals are needed too.   When you make comparisons you should do it right. A cantilever beam usualy has a stress failure caused by the bending moment not a shear failure. Brackets experience shear failure.   <blockquote class="quote"> <div class="quote-user">dehusman</div> <div class="quote-content">One is a shear failure, the other is a deformation.</div> </blockquote>   Wrong, both are shear failures only with different consequences. My comment to your post: In his post dhusman tried to explain to the difference between slope failure and soil liquifaction in terms of structural systems. Slope failure: <a>http://dkgeo.de/Bild/boeschungsbruch.jpg</a> It is in German but self-explanatory. Results of soil liquifaction: <a href="https://www.researchgate.net/profile/Sayed_Ahmed11/publication/288515983/figure/fig9/AS:319868416086025@1453273981382/Failure-of-apartment-buildings-by-tilting-in-Niigata-due-to-liquefaction-Source.png">https://www.researchgate.net/profile/Sayed_Ahmed11/publication/288515983/figure/fig9/AS:319868416086025@1453273981382/Failure-of-apartment-buildings-by-tilting-in-Niigata-due-to-liquefaction-Source.png</a> Very simplyfied, how good a soil withstands forces depends on the interlocking of the single grains, their compaction and, in case of cohesive soil, cohesion. One indicator is shear resistance. When a slope failure occurs, a load on top might lead to shear forces in the soil exceeding the shear resistance. Other reasons can be too steep slope, too high slope, vibration. With soil liquifaction under special soil and water condition vibrations can lead to a shear resistance reduction to zero. Now the soil reacts like a fluid and e.g. buildings loose the resistance under their foundation. In both cases we have a shear failure, though with different causes and consequences. Here is a nice picture how liquifaction can lead to slope failure. Though funny looking it is right: <a href="https://slideplayer.com/slide/7951733/25/images/13/IMPORTANT%20CONCEPTS%20INTERNAL%20CAUSES%20OF%20SLOPE%20FAILURE%20Quick%20sand.jpg">https://slideplayer.com/slide/7951733/25/images/13/IMPORTANT%20CONCEPTS%20INTERNAL%20CAUSES%20OF%20SLOPE%20FAILURE%20Quick%20sand.jpg</a> I hope that helps. Otherwise ask, please. Regards, Volker
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